What a Strange Desire

A pair of aliens observing Earth get a leave of absence. Taking over the bodies of two slackers, they set off on an exciting journey where they discover that humans have one wonderful organ that can be used to have a great time. Especially in the company of those who don't have such an organ. So, the rascals who have tasted the forbidden fruit now have no desire to return to the disembodied state of pure reason...